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3rd grade · Math · Unit 11 of 13

Times Tens

Multiply by 10, 20, 30 ...

What your child practices

Multiplying a one-digit number by a multiple of ten (like 6 × 40) using a basic fact and place value.

Oregon State Standards learning standard: 3.NBT.A.3 · multiplying one-digit whole numbers by multiples of 10 from 10 to 90

How we explain it

Children can open this short lesson before they practice.

  1. Use the basic fact first.
  2. Then multiply by 10: the answer is that many tens.
  3. 6 × 40 is 6 × 4 tens.

Example: What is 6 × 40? 6 × 4 = 24. 24 tens = 240. Answer: 240

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    There are 5 shelves with 40 books in each. How many books are there?

    • 45
    • 220
    • 20
    • 2000
    • 200

  2. Question 2

    9 × ? = 720. What number is missing?

    • 110
    • 60
    • 90
    • 80
    • 800

  3. Question 3

    4 × 5 = 20. So what is 4 × 50?

    • 20
    • 2000
    • 30
    • 200
    • 170

  4. Question 4

    What is 3 × 10?

    3 × 10 = ?

    • 3
    • 13
    • 300
    • 30

  5. Question 5

    There are 5 boxes with 40 crayons in each. How many crayons are there?

    • 170
    • 200
    • 45
    • 2000
    • 20

  6. Question 6

    What is 2 × 70?

    2 × 70 = ?

    • 14
    • 140
    • 1400
    • 72

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